1985 190d COLD AIR ON FEET

[vtmbz]

Now that winter is nearly here-- I seem to have no hot air on the floor, only cold, and cold air oozing out of the ashtray area. PO put in a new climate control panel at some point. Otherwise the ccu seems to be working well.

Where do I start searching for this? With the ccu off, no air movement. Only when I select for floor heat do I get this condition. Thanks!